Mitsubishi Electric FR-A700 Series, Техническое руководство

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PARAMETER
2.7.5 Real sensorless vector control [Pr. 71, 80, 81, 450, 451, 453, 454, 800]
(A700)
Real sensorless vector control is the control method which
divides the inverter output current into an excitation current
and a torque current by vector calculation, and improves low
torque, speed control range, and speed response by
controlling frequency and voltage optimally to flow a motor
current which meets the load torque, achieving maximum of
200% (3.7kW or less) high torque at 0.3Hz. It responds to the load variation quickly (high response) by
torque current control and torque control is also enabled by
giving torque command.
(1) Conditions of Real sensorless vector
control selection
Real sensorless vector control may only be utilized
effectively when all of the following conditions are
satisfied.
If any of the conditions cannot be satisfied, torque
shortage, speed fluctuation or another fault may
occur. Operate under V/F control in that case.
(2) Selection method of Real sensorless
vector control
Set any of 10 to 12 in [ Pr. 800 Control method selection ].
Setting any value other than 9999 in [ Pr. 80 Motor
capacity ] and [ Pr. 81 Number of motor poles ] selects
Real sensorless vector control. V/F control is chosen
when either of the [
Pr. 80 or Pr. 81 ] setting is 9999.
When [ Pr. 81 = 12, 14, 16, 18, 20 ], you can select
between V/F control and Real sensorless vector
control by switching ON/OFF the X18 signal.
Set [
Pr. 71 ] according to the motor used. Perform
offline auto tuning without fail to perform Real
sensorless vector control even using the Mitsubishi
motor.
After setting [ Pr. 9, 83, 84 ], set [ Pr. 96 = 1 or 101 ] to
perform offline auto tuning. For details, refer to page
268.
A700
[ Pr. ] Name
Initial
Value
Setting Range Description
71 Applied motor 0
0 to 8, 13 to 18, 20, 23, 24, 30,
33, 34, 40, 43, 44, 50, 53, 54
By selecting a standard motor or constant torque motor,
thermal characteristic and motor constants of each motor
are set.
80 Motor capacity 9999
55K or less 0.4 to 55kW
Set the applied motor capacity.
75K or more 0 to 3600kW
9999 V/F control
81 Number of motor poles 9999
2, 4, 6, 8, 10 Set the number of motor poles.
12, 14, 16, 18, 20
X18 signal-ON:
V/F control *
Set 10 + number of motor poles.
9999 V/F control
450 Second applied motor 9999
0 to 8, 13 to 18, 20, 23, 24, 30,
33, 34, 40, 43, 44, 50, 53, 54
Set when using the second motor.
(Same specifications as [
Pr. 71 ] )
9999 Function invalid ([
Pr. 71
] is valid.)
451
Second motor control
method selection
9999
10, 11, 12 Real sensorless vector control
20, 9999 V/F control (Advanced magnetic flux vector control)
453 Second motor capacity 9999
55K or less 0.4 to 55kW
Set the capacity of the second motor.
75K or more 0 to 3600kW
9999 V/F control
454
Number of second motor
poles
9999
2, 4, 6, 8, 10 Set the number of poles of the second motor.
9999 V/F control
800 Control method selection 20
0 to 5
V/F control **
Vector control
9 Vector control test operation
10, 11, 12 Real sensorless vector control
20 Advanced magnetic flux vector control
* Use [ Pr. 178 to Pr. 189 ] to assign the terminals used for the X18 and MC signal.
** When [
Pr. 80 Motor capacity
= 9999] or [
Pr. 81 Number of motor poles
= 9999], control method is V/F control regardless of the [
Pr. 800
] setting.
The motor capacity should be equal to or one rank
lower than the inverter capacity.
Note that the motor capacity should be 0.4kW or
more.
Perform offline auto tuning (refer to page 268)
independently of the Mitsubishi motor and other
manufacturer’s motor.
Single-motor operation (one motor run by one
inverter) should be performed.
Motor [ Pr. 71 ]
*1
Remarks
Mitsubishi standard
motor
Mitsubishi high
efficiency motor
SF-JR 3
Offline
auto tuning is
necessary.
*2
SF-JR 4P 1.5kW or less 23
SF-HR 43
Others 3
Mitsubishi constant-
torque motor
SF-JRCA 13
SF-HRCA 53
Others (SF-JRC etc.) 13
Other manufacturer's
standard motor
— 3
Other manufacturer's
constant-torque
motor
— 13
*1 For other settings of [
Pr. 71
], refer to page 266.
*2 Refer to page 268 for offline auto tuning.